LNS QUICK LOAD SERVO S3 Troubleshooting And Spare Parts Manual page 43

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AL.31 Overspeed
AL.32 Overcurrent
AL.33 Overvoltage
AL.35 Command pulse
frequency error
AL.37 Parameter error
QUICK LOAD SERVO S3
Speed has 1. Input command pulse
exceeded the frequency exceeded the
instantaneous permissible instantaneous speed
permissible speed. frequency.
2. Small acceleration/deceleration
time constant caused overshoot to
be large.
3. Servo system is instable to
cause overshoot.
4. Electronic gear ratio is large
(parameters No. 4, 5)
5. Encoder faulty.
Current that flew is 1. Short occurred in servo
higher than the amplifier output phases U, V and
permissible current W.
of the servo
2. Transistor (IPM) of the servo
amplifier.
amplifier faulty.
Alarm (AL.32) occurs if power is
switched on after U, V and W are
disconnected.
3. Ground fault occurred in servo
amplifier output phases U, V and
W.
4. External noise caused the
overcurrent detection circuit to
misoperate.
Converter bus 1. Lead of built-in regenerative
voltage exceeded brake resistor or regenerative
400V. brake option is open or
disconnected.
2. Regenerative transistor faulty.
3. Wire breakage of built-in
regenerative brake resistor or
regenerative brake option
4. Capacity of built-in regenerative
brake resistor or regenerative
brake option is insufficient.
5. Power supply voltage high.
Input pulse 1. Pulse frequency of the manual
frequency of the pulse generator is too high.
command pulse is
2. Noise entered the pulses of the
too high.
manual pulse generator.
3. Manual pulse generator failure
Parameter setting 1. Servo amplifier fault caused the
is wrong. parameter setting to be rewritten.
2. Regenerative brake option not
used with servo amplifier was
selected in parameter No.0.
Set command pulses correctly.
Increase acceleration/deceleration time
constant.
1. Re-set servo gain to proper value.
2. If servo gain cannot be set to proper
value:
1) Reduce load inertia moment ratio; or
2) Reexamine
acceleration/deceleration time
constant.
Set correctly.
Change the servo motor.
Correct the wiring.
Change the servo amplifier.
Checking method
Correct the wiring.
Take noise suppression measures.
1. Change lead.
2. Connect correctly.
Change servo amplifier
1. For wire breakage of built-in
regenerative brake resistor, change
servo amplifier.
2. For wire breakage of regenerative
brake option, change regenerative
brake option.
Add regenerative brake option or
increase capacity.
Review the power supply.
Change the pulse frequency to a
proper value.
Take action against noise.
Change the manual pulse generator.
Change the servo amplifier.
Set parameter No.0 correctly.
Chapter 1: Alarms